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With tensions rising in Crimea and pro-Russian forces controlling the peninsula's main airports, Ukrainian Prime Minister Arseniy Yatsenyuk has called on Russia to "not violate the Budapest Memorandum." So what is the "Budapest Memorandum" and what does it have to do with Crimea?

What exactly is the "Budapest Memorandum"?

The "Budapest Memorandum on Security Assurances" is a diplomatic memorandum that was signed in December 1994 by Ukraine, Russia, the United States, and the United Kingdom.

It is not a formal treaty, but rather, a diplomatic document under which signatories made promises to each other as part of the denuclearization of former Soviet republics after the dissolution of the Soviet Union.

Under the memorandum, Ukraine promised to remove all Soviet-era nuclear weapons from its territory, send them to disarmament facilities in Russia, and sign the Nuclear Nonproliferation Treaty. Ukraine kept these promises.

In return, Russia and the Western signatory countries essentially consecrated the sovereignty and territorial integrity of Ukraine as an independent state. They did so by applying the principles of territorial integrity and nonintervention in 1975 Helsinki Final Act -- a Cold War-era treaty signed by 35 states including the Soviet Union -- to an independent post-Soviet Ukraine.

Which principles in the Helsinki Final Act, reiterated in the "Budapest Memorandum," are relevant to the current situation in the Crimea?

In the "Budapest Memorandum," Russia, the United Kingdom, and the United States promised that none of them would ever threaten or use force against the territorial integrity or political independence of Ukraine. They also pledged that none of them would ever use economic coercion to subordinate Ukraine to their own interest.

They specifically pledged they would refrain from making each other's territory the object of military occupation or engage in other uses of force in violation of international law.

All sides agreed that no such occupation or acquisition will be recognized as legal and that the signatories would "consult in the event a situation arises which raises a question concerning these commitments."

"That's actually a much more complex question than it may sound. It is binding in international law, but that doesn't mean it has any means of enforcement," says Barry Kellman, a professor of law and director of the International Weapons Control Center at DePaul University's College of Law.

"The 'Budapest Memorandum' follows the Helsinki Final Act and essentially reiterates its provisions. There are confidence building measures and then a host of other broader obligations – primarily negative obligations. Don't interfere."

Kellman concludes that there are a host of other sources of international law that oblige Russia to respect Ukraine's territorial integrity -- including the provisions of the CSCE treaty and the UN Charter.

At this year's annual South by Southwest film and music festival in Austin, Texas, some musicians from Mali were on hand to promote a film about how their lives were upturned by jihadists who destroyed ancient treasures in the city of Timbuktu and prohibited anyone from playing music under threat of death. As VOA’s Greg Flakus reports from Austin, some are afraid to return to their hometowns even though the jihadists are no longer in control there.

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At this year's annual South by Southwest film and music festival in Austin, Texas, some musicians from Mali were on hand to promote a film about how their lives were upturned by jihadists who destroyed ancient treasures in the city of Timbuktu and prohibited anyone from playing music under threat of death. As VOA’s Greg Flakus reports from Austin, some are afraid to return to their hometowns even though the jihadists are no longer in control there.

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American warplanes joined Iraq's battle against the so-called 'Islamic State' in northern Iraq late Wednesday, as Iraqi ground troops launched a massive assault on Tikrit. Analysts say the offensive could take the coalition a step further towards Mosul, the largest city held by Islamic State forces. Others say it could also deepen already-dangerous sectarian tensions in the region. VOA's Heather Murdock has more from Cairo.

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Tourism is a multi-billion dollar industry in the Philippines. Close to five million foreign visitors traveled there last year, perhaps lured by the country’s tropical beaches. But Jason Strother reports from Manila that the country hopes to entice more travelers to stay indoors and spend money inside new casinos.

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The continued fighting in eastern Ukraine and the shelling of civilian neighborhoods seem to be pushing more men to join the separatist fighters. Many of the new recruits are residents of Ukraine made bitter by new grievances, as well as old. VOA's Patrick Wells reports.

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Islamic State fighter, a prisoner of Kurdish YPG forces, asked his family asking for forgiveness: "I destroyed myself and I destroyed them along with me." The Syrian youth was one of two detainees who spoke to VOA’s Kurdish Service about the path they chose; their names have been changed and identifying details obscured. VOA's Zana Omer reports.

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More is being discovered about the co-pilot in the crash of Germanwings Flight 9525 in the French Alps. Investigators say he was hiding a medical condition, raising questions about the mental qualifications of pilots. VOA's Carolyn Presutti reports.

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In cities with heavily congested traffic, people can get around much faster on a motorcycle than in a car. But a rider who is not sure of his route may have to stop to look at the map or consult a GPS. A Russian start-up company is working to make navigation easier for motorcyclists. Designers at Moscow-based LiveMap are developing a smart helmet with a built-in navigation system, head-mounted display and voice recognition. Zlatica Hoke has more.

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U.S. federal law enforcement agents arrested two suburban Chicago men accused of trying to join ISIS overseas, while also plotting attacks in the United States. As VOA’s Kane Farabaugh reports from the Midwest state of Illinois, one of those arrested is a soldier of the Illinois National Guard.

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Traditional push-rim wheelchairs create a lot of stress for arm, shoulder and neck muscles and joints. A redesigned chair, based on readily available bicycle technology, radically increases mobility while reducing the physical effort. VOA’s George Putic reports.

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Beatrice Yardolo was to make history as Liberia’s last Ebola patient. Liberians recently started counting down 42 days, the period that has to go by without a single new infection until the World Health Organization can declare a country Ebola-free. That countdown stopped on March 20 when there was another new case of Ebola, making Yardolo’s story a reminder that Ebola is far from over. Benno Muchler reports from Monrovia.

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Indigenous communities in Cambodia's Ratanakiri province say the government’s economic land concession policy is taking away their land and traditional way of life, making many fear that their identity will soon be lost. Local authorities, though, have denied this is the case. VOA's Say Mony went to investigate and filed this report, narrated by Colin Lovett.

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One of the films that drew big crowds last week at the annual South by Southwest festival in Austin, Texas, tells the story of the last human being to stand on the moon, U.S. astronaut Eugene Cernan. It has been 42 years since Cernan returned from the moon and he laments that no one else has gone there since. VOA’s Greg Flakus reports.